False Sunflower
Heliopsis
False Sunflower blooms from July through September.
This entry comes from our curated library and has not yet been independently checked against outside sources. Curated is not unreliable: a standing audit keeps every entry internally consistent, and the source-by-source check is working through the whole library in the open.
Growing False Sunflower
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 3–9. Expect it to reach about 3.9 ft tall and 2 ft wide at maturity, in roughly 2 years.
When to plant False Sunflower
Plant False Sunflower in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. For the middle of its hardy zones 3 to 9 range, spring means March to May and fall means August or September. Once settled, it blooms from July to September.
Month-by-month timing for your zone is on the planting calendar: for the middle of its range, start with zone 6 in March.
Good to know about False Sunflower
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Worth knowing
Feed it too well and it flops. Rich or over-fertilized soil, shade and constant moisture make the tall stems lean; full sun and lean soil keep them upright. per Chicago Botanic Garden and Missouri Botanical
How disease-prone it is
In full sun with good airflow it is largely trouble-free, but crowded, shaded, over-fed or humid plantings get powdery mildew and rust. The fix is spacing, not spraying. per NC State and Missouri Botanical
Feeds pollinators and birds
The showy blooms draw bees, butterflies and hummingbirds; songbirds eat the seeds in fall, so leaving spent heads standing feeds the birds. per NC State
Usually left alone by deer
Generally deer-resistant and not much browsed, though very hungry deer may still sample it. per NC State and Chicago Botanic Garden
Self-sows into colonies
It self-sows readily and can form colonies. Deadhead spent flowers before the seed sets to curb unwanted volunteers, or leave them to spread. per NC State and Missouri Botanical
Why 'false' sunflower
It looks like a true sunflower but sits in the genus Heliopsis, not Helianthus, and unlike annual sunflowers it is a long-lived clumping perennial. per NC State and Iowa State
What pairs well with False Sunflower
Good companions share its growing conditions and add something it lacks: an earlier or later bloom, a lower carpet in front, or structure through winter.
English Daisy
Shares full sun and moderate water; blooms in mid spring, before this one opens; low at 6 in, to carpet the ground beneath; both offer pollinator forage, in different months.
Pansy
Takes full sun to part sun and moderate water; blooms in early spring, before this one opens; lower at 8 in, for the front of the border; both offer pollinator forage, in different months.
Chives
Shares full sun and moderate water; blooms in late spring, before this one opens; both are strong pollinator plants, and they feed in different months; lower at 12 in, for the front of the border.
Creeping Phlox
Shares full sun and low to moderate water; blooms in mid spring, before this one opens; low at 6 in, to carpet the ground beneath; both are strong pollinator plants, and they feed in different months.
Autumn Crocus
Shares full sun and moderate water; overlaps, then carries the display into mid fall; low at 6 in, to carpet the ground beneath; both offer pollinator forage.
Hyacinth
Shares full sun and moderate water; blooms in early spring, before this one opens; lower at 10 in, for the front of the border; both offer pollinator forage, in different months.
Sweet Alyssum
Shares full sun and moderate water; low at 5 in, to carpet the ground beneath; overlaps, then carries the display into mid fall; both are strong pollinator plants.
Canterbury Bells
Shares full sun and moderate water; blooms in late spring, before this one opens; both offer pollinator forage, in different months; lower at 2.3 ft, for the front of the border.
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